This reference provides the dimensional information for an 8-inch Class 600 blind flange, including flange thickness, weight, stud bolt details, bolt quantity, and hole diameter. Use the listed values for drafting and preliminary coordination, then verify the complete flange assembly against the project specification before fabrication or installation.
A blind flange has no center opening, so its main function is to close a piping connection rather than provide a passage for fluid. For related reference work, compare this page with pipe schedules, flange dimensions, flange facing types, and piping CAD/DWG resources.
Blind Flange 8″ Class 600
Blind Flange 8″ Class 600 is used to seal the end of a piping system or close off a flange connection in Class 600 service. It is a solid flange without a center bore and is commonly used in industrial piping systems, maintenance isolation points, and future pipeline expansion connections where a higher pressure rating is required.
This dimension data is based on ANSI / ASME B16.5-2020.
Blind Flange 8″ Class 600 Dimensions
- Reference Standard: ANSI / ASME B16.5
- Nominal Pipe Size (NPS): 8″
- DN Size: DN200
- Flange Thickness: 55.6mm
- Weight: 64kg
- Stud Bolt Size: 1 1/8″ UNC (or M30) x 190 Long
- Number of Bolts: 12
- Hole Diameter: 1 1/4″ (31.75mm)
What Is a Blind Flange?
A blind flange is a blank flange used to close the end of a pipeline, vessel nozzle, or equipment connection. It provides a secure shutoff point and is often selected when future maintenance, inspection, or line extension may be required.
Common Applications
Blind Flange 8″ Class 600 is commonly used for:
- Pipe end closure
- Equipment isolation
- Valve and nozzle blanking
- Maintenance shutdown work
- Process and utility piping systems
- Higher pressure piping applications
CAD Drawing Download
This page includes the CAD drawing file for Blind Flange 8″ Class 600, which can be used for drafting, detailing, and piping layout coordination.
Available Blind Flange Class 600 Sizes
This size is part of the Blind Flange Class 600 series. Check other sizes in the same category to find matching dimension data and CAD files for your project.
Notes
Before fabrication or installation, always confirm the latest project requirements, flange material specification, gasket type, bolt length, and applicable pressure-temperature rating.
How to Read This Blind Flange Reference
The nominal pipe size identifies the connection size used for piping coordination, while the DN designation provides the corresponding metric size label. These are nominal identifiers; they should not be treated as the measured outside diameter of the flange or pipe.
The listed flange thickness and weight are useful for layout, support coordination, handling plans, and preliminary material estimates. Weight can also affect temporary lifting arrangements and the design of adjacent supports, particularly where a blanked connection is installed near equipment or a valve.
The stud bolt size, bolt length, number of bolts, and hole diameter describe the bolting arrangement shown in the source data. Keep these items together when checking a connection: the fastener specification must match the flange holes, gasket arrangement, washers where required, and the installation procedure. Do not select replacement bolts by diameter alone.
Design and Drafting Checks
- Confirm the flange facing and gasket type required by the piping specification.
- Check that the mating flange uses the same nominal size, class designation, facing arrangement, and compatible bolting pattern.
- Coordinate the blind flange with valves, nozzles, supports, insulation, access, and maintenance clearances.
- Verify material requirements and the applicable pressure-temperature limitations before approval.
- Use the downloadable DWG as a drafting aid, then confirm critical dimensions against the project-approved reference.
The Class 600 designation is not, by itself, a universal allowable pressure for every material and operating temperature. Final selection requires the applicable material specification, gasket and bolting requirements, service conditions, and project engineering review.
Related Reference Topics
Readers comparing this component with other piping hardware may also need references for raised-face and ring-type-joint flanges, pipe flange bolt patterns, ASME B16.5 flange terminology, and blind flange CAD files. Linking these topics helps users move from a single dimensional reference to a complete piping connection check.
Frequently Asked Questions
What is an 8-inch Class 600 blind flange used for?
It is used to close a piping end or flange connection where a solid, removable blank is required. Typical uses include isolation, maintenance shutdowns, equipment blanking, and future connection points.
Does a blind flange have a center bore?
No. A blind flange is a solid flange without a center bore. Its purpose is to block the connected line or nozzle.
What information is included in this reference?
The source data identifies the nominal pipe size, DN designation, flange thickness, weight, stud bolt size and length, bolt quantity, and hole diameter. It also provides a CAD drawing download.
Can the listed stud bolts be selected without checking the gasket and mating flange?
No. Bolt selection should be checked with the mating flange, gasket, washers where applicable, material requirements, thread specification, and installation procedure.
Is Class 600 enough information to determine the allowable working pressure?
No. Allowable pressure depends on the applicable standard, material, temperature, component configuration, and project requirements. Confirm the pressure-temperature basis through the responsible piping or mechanical engineer.